暗条纹是漏出的沙子。
一条暗条纹是在每次土卫十六飞过f环时产生的。
One dark streamer is created during each pass of Prometheus through the F-ring that it shepherds.
暗条纹也是个绝佳之选，因为对比色会增加视觉深度。
Also, it would be best to stick with darker stripes, because contrasting colors add more depth.
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